missed period

Issy
So as I explained in my last post I have been absolutely shitting myself that I was pregnant for the last week. My period (according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>) is now 6 days late, yesterday I took a test and it was negative. I've been getting a few light cramps but that's about it. Has my stress caused me to miss my period or am I just late?